Ok well there are some basic symptoms that we need to look at. The first is the electronics.

1. If your marker is not air'd up and you depress the trigger do you hear the solenoid click?
--If no then you need to change your battery.
--If battery is good then you need to check your harness connections and swap out a fresh board.
--if not the board or harness then you need a new noid.

A fast check on this is the hot wire the battery to the noid to try and make it click. This will tell you if the problem is in the board/harness and not the noid.

2. If the noid clicks when the marker is not air'd then it means that either there is no air getting to the noid or the ram is faulty.
--so double check your LPR by cranking it up until you hear the leak and then backing it off a few to verify you have air flow.
--then do a general check of your ram.

These are pretty basic markers and I'm almost 100% sure that its an electronic problem but if not then you have a clog some where. Not unheard of, but rare.

So I tried replacing the regulator (needed a new one anyways) and its still won't fire. I just hear a click from the noid like I was dry firing it, my next instinct is to take the tray off and check the air passage ways. could that be the problem?

2. Turn up your LPR until the noid begins to leak. I'm going to take a guess here but I bet your LPR isn't letting any air into your ram because it's been rebuilt improperly. If you can't get the noid to leak by turning it up take your va off your gun and disconnect the air hose. Put it back on and turn the LPR all the way down. Now gas up the marker and slowly turn up the LPR to see if any air starts coming out.

If the LPR turns out to be the issues get a new VA that allows you to attach a "cocker" style LPR. I think you can still find them on Ebay or maybe Amazon.